Wrapping Paper For A Smoking Article

ABSTRACT

A wrapping paper for a smoking article includes a base paper, wherein the base paper comprises a fibrous material, a filler material, and one or more burning additives. A paper porosity of the base paper is of 10 to 60 CU. A total amount of the one or more burning additives is of 0.1 to 0.7 wt.-% based on the a dry weight of the base paper.

TECHNICAL FIELD

The present invention relates to a wrapping paper for a smoking articleand a smoking article comprising a wrapping paper.

BACKGROUND ART

For most smokers, smoking of a single cigarette with around 7 to 12puffs under standard smoking condition (ISO), depending on the tobaccorod length and its diameter, provides a satisfactory smoking experience.In order to reach the number of desired puffs, several solutions areknown from the state of the art.

U.S. Pat. No. 5,379,788 teaches a cigarette system which has a greaternumber of puffs than a conventional cigarette of same dimensions andlength of tobacco rod, namely at least about 14 puffs. The cigarettesare intended to be partially smoked, extinguished, stored and thenresmoked. A filter is attached to the tobacco rod of the cigaretteconstructed to provide a per-puff delivery profile of tar, nicotine andflavor to the smoker which is approximately the same for both smokingsof the cigarette. The greater-than-normal number of puffs is achieved byemploying a slower burning tobacco blend, greater tobacco density and/orburn rate retardant paper.

US 2011/083,687 A1 discloses a burn rate of a smoking article which isreduced by incorporating into the paper a filler having a medianparticle size larger than about 2.5 microns and thereby increasing thenumber of puffs.

Japanese Patent No. 2834325 discloses a cigarette in which a cut tobaccodensity is set at 300 mg/cc or more in order to decrease the combustionrate of the cut tobacco rod, thereby increasing the number of puffsprovided by the cigarette.

The problem of the present invention is to provide a wrapping paper thatcan increase the puff count of a smoking article without changing thetobacco rod length or diameter and without impacting on the TNCO levelsof the smoking article.

BRIEF DESCRIPTION OF THE INVENTION

The inventors have found that by providing a wrapping paper with acertain porosity and a certain amount of a burning additive it ispossible to increase the puff count of the smoking article.

A first aspect of the present invention relates to a wrapping paper fora smoking article, comprising a base paper, wherein the base papercomprises a fibrous material, a filler material and one or more burningadditives, wherein a paper porosity of the base paper is of 10 to 60 CU,and a total amount of burning additive is of 0.1 to 0.7 wt.-% based onthe dry weight of the base paper.

In another aspect of the present invention, a smoking article comprisinga charge of smokable material surrounded by a wrapping paper accordingto the first aspect of the invention is disclosed.

Further aspects and embodiments of the invention are disclosed in thedependent claims and can be taken from the following description andexamples, without being limited thereto.

FIGURES

The enclosed drawings should illustrate embodiments of the presentinvention and convey a further understanding thereof. In connection withthe description it serves as explanation of concepts and principles ofthe invention. Other embodiments and many of the stated advantages canbe derived in relation to the drawings.

FIG. 1 shows an enlarged schematic perspective view showing an exampleof a smoking article according to the present invention. A smokingarticle 40 shown in FIG. 1 is provided with a smokable rod 410 having afront end 410 a and a base end 410 b constituting an ignition end and afilter 420 having a front end 420 a and a base end 420 b. In thecigarette rod 410 and the filter 420, the base end 410 b of the smokablerod and the front end 420 a of the filter are abutted against eachother, whereby the smokable rod 410 and the filter 420 are connected bya tipping paper 430. The smokable rod 410 is constituted of a rod 411 oftobacco filler and a wrapping paper 412 wrapping an outercircumferential surface of the tobacco filler rod 411. A wrapping paper412 is constituted of a wrapping paper according to the presentinvention.

FIG. 2 is a schematic perspective view, partly broken away, showing anexample of a cigarette that is wrapped with a cigarette paper havingstripe-shaped burn-suppressing regions according to one embodiment ofthe present invention.

The cigarette 10 has a tobacco rod 11 consisting of a tobacco filler 13that is wrapped with a wrapping paper 12 of the present invention in theform of a column. An ordinary filter 15 may be attached to the proximalend (namely, the downstream end in the inhaling direction) 11 b of thetobacco rod 11 by using a tipping paper 14 according to a conventionalmethod.

A plurality of stripe-shaped burn-suppressing regions 122, which arecoated as will be explained in the forthcoming description, are formedon one of the surfaces of the base paper 121 that constitutes thewrapping paper 12 of the present invention. These stripe-shapedburn-suppressing regions 122 are formed apart from each other in thecircumferential direction of the tobacco rod 11.

Non-burn-suppressing regions 123 are formed between the adjacentstripe-shaped burn-suppressing regions 122. Since the regions 123 areconstituted by a part of the base paper 121, they can burn in anordinary smoking state. Therefore, the regions 123 each act as anon-burn-suppressing region. For example, the stripe-shapedburn-suppressing regions 122 each may have a width of 1 to 6 mm in thecircumferential direction. The distance between the adjacentburn-suppressing regions 122 may be 2 to 20 mm.

In the cigarette shown in FIG. 2, a non-burn-suppressing region 124 maybe provided to the region covering a distance d from the tip 11 a of thebase paper 121.

FIG. 3 is a schematic perspective view, partly broken away, showing anexample of a cigarette that is wrapped with a cigarette paper havingannular band-shaped burn-suppressing regions according to anotherembodiment of the present invention.

The cigarette 20 has a similar structure to that of the cigarette 10shown in FIG. 2, except for the structure of the burn-suppressingregions in the wrapping paper. Therefore, in FIG. 3, an identicalreference number is assigned to the same element as the constitutionalelement in FIG. 2, and the explanation thereof is omitted.

In the cigarette 20 shown in FIG. 3, a plurality of annular band-shapedburn-suppressing regions 211 are formed on the base paper 121 of thewrapping paper 21 wrapping the tobacco filler 13, definingburn-suppressing regions. These annular band-shaped burn-suppressingregions 211 are formed apart from each other in the longitudinaldirection of the tobacco rod 11.

Non-burn-suppressing regions 212 are formed between the adjacent annularband-shaped burn-suppressing regions 211. Since the non-burn-suppressingregions 212 are constituted by a part of the base paper 121, they canburn in an ordinary smoking state. Therefore, the regions 212 each actas non-burn-suppressing region, as the regions 123 in FIG. 2 do. Forexample, the annular band-shaped burn-suppressing regions 211 each mayhave a width of 4 to 7 mm in the longitudinal direction. The distancebetween the adjacent burn-suppressing regions 24 may be 18 to 25 mm.

DETAILED DESCRIPTION OF THE INVENTION

Unless defined otherwise, technical and scientific terms used hereinhave the same meaning as commonly understood by one of ordinary skill inthe art to which this invention belongs.

All values given in the present disclosure are to be understood to becomplemented by the word “about”, unless it is clear to the contraryfrom the context.

Smoking articles as referred to herein are not particularly limited andcan for example be cigarettes, cigarillos or the like. They typicallyhave a generally cylindrical rod shaped configuration and include acharge, roll, or column of smokable material, such as shredded tobacco(e.g. in cut filler form), which is surrounded by a paper wrapperforming a so-called “tobacco rod”. A cigarette or cigarillo usually alsohas a cylindrical filter element aligned in end-to-end relationship withthe tobacco rod. The filter element may, for example, comprise a plug ofcellulose acetate tow, and the tow is circumscribed by a wrappermaterial known as “plug wrap”. Typically, the filter element is attachedto one end of the tobacco rod using a circumscribing wrapping materialknown as “tipping wrapper”. The filter element wrapped by the tippingwrapper is known as “mouthpiece element”.

As used herein, wt.-% is to be understood as weight percent, based onthe dry weight of the base paper of the wrapping paper, unlessexplicitly otherwise specified. In the present disclosure, all amountsgiven in wt.-% in a particular embodiment add up to 100 wt.-%. Theweight percent are thereby calculated by dividing the mass of eachcomponent by the dry mass of the base paper.

TNCO levels as referred to herein stand for tar, nicotine and carbonmonoxide levels and can be measured by any suitable method. In thepresent invention this is done according to ISO 3308:2012.

The symbol “CU” herein designates the CORESTA air permeability unit thatis commonly used in paper specifications by smoking article designers.The CORESTA air permeability unit is defined as: “the volumetric flowrate of air in cubic centimeters per minute (cm³/min) passing through a1 square centimeter (cm²) sample of substrate at an applied pressuredifference of 1 kilo-Pascal (kPa).” and are measured according to ISO6565:2011.

The number of puffs of a smoking article may be measured by any suitablemethod. In the present invention this is done according to ISO3308:2012.

The present invention relates to a wrapping paper for a smoking articlecomprising a base paper, wherein the base paper comprises a fibrousmaterial, a filler material and one or more burning additives, wherein apaper porosity of the base paper is of 10 to 60 CU, and a total amountof burning additive is of 0.1 to 0.7 wt.-% based on the dry weight ofthe base paper. By providing a wrapping paper with such porosity andamount of burning additive it is possible to increase the puff count ofthe smoking article.

In certain embodiments of the present wrapping paper, the paper porosityof the base paper is 10 to 50 CU, e.g. 15 to 45 CU. For example, in someembodiments the paper porosity of the base paper is 10 to 20 CU, e.g. 13to 17 CU, e.g. 15 CU. In other embodiments, the paper porosity of thebase paper is 25 to 35 CU, e.g. 28 to 32 CU, e.g. 30 CU. In furtherembodiments, the paper porosity of the base paper is 40 to 50 CU, e.g.43 to 47 CU, e.g. 45 CU. This further increases the puff count of thesmoking article.

In certain embodiments of the present wrapping paper, the burningadditive is included in the base paper in an amount of 0.2 to 0.6 wt.-%,e.g. 0.3 to 0.5 wt.-% based on the dry weight of the base paper. Forexample, in some embodiments the total amount of burning additive is inan amount of 0.2 to 0.4 wt.-%, e.g. 0.3 wt.-%, based on the dry weightof the base paper. In other embodiments, the total amount of burningadditive is in an amount of 0.3 to 0.5 wt.-%, e.g. 0.4 wt.-%, based onthe dry weight of the base paper. In further embodiments, the totalamount of burning additive is in an amount of 0.4 to 0.6 wt.-%, e.g. 0.5wt.-%, based on the dry weight of the base paper. This further increasesthe puff count of the smoking article.

In certain embodiments of the present wrapping paper, the burningadditive is selected from the group consisting of citrate salts, e.g.sodium and potassium citrate, acetate salts, e.g. sodium and potassiumacetate, phosphate salts, e.g. sodium and potassium phosphate, tartratesalts, e.g. sodium and potassium tartrate, nitrate salts, e.g. sodiumand potassium nitrate, or mixtures thereof.

The burning additive is not particularly limited, as long as it issuitable for use in a smoking article. In certain embodiments citratesalts are used.

In certain embodiments of the present wrapping paper, the amount offiller in the base paper is 17 to 28 wt.-%, e.g. 20 to 25 wt.-%, basedon the dry weight of the base paper. For example, the amount of fillerin the base paper is 19 to 25 wt.-%, e.g. 21 to 23 wt.-%, e.g. 22 wt.-%,based on the dry weight of the base paper. In other embodiments, theamount of filler in the base paper is 22 to 28 wt.-%, e.g. 24 to 26wt.-%, e.g. 25 wt.-%, based on the dry weight of the base paper. Infurther embodiments, the amount of filler in the base paper is 17 to 23wt.-%, e.g. 19 to 21 wt.-%, e.g. 20 wt.-%, based on the dry weight ofthe base paper. This amount of filler provides an adequate resistance tomanufacturing forces to which the wrapping paper is subject to duringhigh speed manufacturing and also allows obtaining a desired opacity ofthe wrapping paper.

In certain embodiments of the present smoking article comprising awrapping paper, the filler in the wrapping paper is selected from thegroup of calcium carbonate, such as precipitated calcium carbonate (PCC)or ground calcium carbonate (GCC), kaolin, clay, talc, titanium dioxide,alumina trihydrate, precipitated silica and silicates (PSS), andmixtures thereof.

Just like the burning additive, the filler is not particularly limited,as long as it is suitable for use in a smoking article. In certainembodiments calcium carbonate is used.

In one embodiment, the paper porosity of the base paper is 10 to 20 CU,e.g. 13 to 17 CU, e.g. 15 CU, the total amount of burning additive is inan amount of 0.2 to 0.4 wt.-%, e.g. 0.3 wt.-%, based on the dry weightof the base paper, and the amount of filler in the base paper is 19 to25 wt.-%, e.g. 21 to 23 wt.-%, e.g. 22 wt.-%, based on the dry weight ofthe base paper.

In another embodiment, the paper porosity of the base paper is 25 to 35CU, e.g. 28 to 32 CU, e.g. 30 CU, the total amount of burning additiveis in an amount of 0.3 to 0.5 wt.-%, e.g. 0.4 wt.-%, based on the dryweight of the base paper, and the amount of filler in the base paper is22 to 28 wt.-%, e.g. 24 to 26 wt.-%, e.g. 25 wt.-%, based on the dryweight of the base paper.

In a further embodiment, the paper porosity of the base paper is 40 to50 CU, e.g. 43 to 47 CU, e.g. 45 CU, the total amount of burningadditive is in an amount of 0.4 to 0.6 wt.-%, e.g. 0.5 wt.-%, based onthe dry weight of the base paper, and the amount of filler in the basepaper is 17 to 23 wt.-%, e.g. 19 to 21 wt.-%, e.g. 20 wt.-%, based onthe dry weight of the base paper.

According to certain embodiments, the balance to 100 wt.-% of the dryweight of the base paper is essentially filler and fibrous material.

In certain embodiments of the present wrapping paper, the basis weightof the base paper is 20 to 26 g/m², e.g. 21 to 24 g/m², or e.g. 23 to 25g/m², e.g. 24 g/m². By providing a base paper with a basis weightcomprised in these ranges it is possible to obtain a desired opacity ofthe wrapping paper while controlling the level of CO.

In certain embodiments of the present wrapping paper, the diffusioncapacity of the base paper is 1.0 to 2.0 cm/s, e.g. 1.0 to 1.8 cm/s, ore.g. 1.2 to 2.0 cm/s, or e.g. 1.2 to 1.8 cm/s, or e.g. 1.2 to 1.6 cm/s,or e.g. 1.4 to 1.8 cm/s, or e.g. 1.4 to 1.6 cm/s. In the presentinvention the diffusion capacity of a wrapping paper is measuredaccording to CORESTA Recommended Method No. 77 (CRM No. 77 of April2014).

In one embodiment of the invention, the wrapping paper may be used in a“low ignition propensity” smoking article. A “low ignition propensity”smoking article is one that has been designed to be less likely than aconventional cigarette to ignite furnishings and equipment, e.g. softfurnishings such as a couch or mattress. Ideally, a low ignitionpropensity smoking article will continue to burn when freely suspendedsuch as in the holder of an ashtray or when being held in the handwithout puffing (“free burn”). The tendency for a cigarette to go outduring free burn is referred to as “self-extinguishment”.

The capability of a smoking article to extinguish or to generatesufficient heat to continue burning, and thus potentially cause ignitionof bedding or upholstered furniture (referred to as LIP) may be measuredby any suitable method. In the present invention this is done accordingto ISO 12863:2010.

The likelihood of a smoking article to extinguish while burning in freeair (referred to as FASE) may be measured by any suitable method. In thepresent invention this is done according to ISO 12863:2010.

In certain embodiments of the present wrapping paper, the base paper maycomprise a plurality of burn-suppressing regions that are provided apartfrom each other. The burn-suppressing regions may be provided on asurface of the base paper or embedded within a matrix of the base paper.The plurality of burn-suppressing regions may be provided on a samesurface of the base paper. Alternatively, one or more of the pluralityof burn-suppressing regions may be provided on a first surface of thebase paper and the remaining of the plurality of burn-suppressingregions may be provided on a second, opposite surface of the base paper.

Accordingly, the wrapping paper is formed of the base paper, optionallywith burn-suppressing regions provided therein. As the regions of thewrapping paper which are outside the burn-suppressing regions are to beconsidered as non-burn suppressing regions the latter being the same asthe base paper, the present application uses the terms “non-burnsuppressing regions” and “base paper” interchangeably.

The shape and amount of these burn-suppressing regions is not furtherlimited and may vary according to the specific requirements of thesmoking article. In certain embodiments the burn-suppressing regions arein a form of stripes. In one embodiment all stripes are parallel to eachother. In another embodiment at least two stripes are non-parallel toeach other.

These burn-suppressing regions may contain additives that reduce thediffusion capacity of the base paper. The additives that may be appliedto the wrapper may be any of those used in the art to reduce theignition propensity of smoking articles.

In certain embodiments of the present wrapping paper, theburn-suppressing regions contain at least one additive that reduces thediffusion capacity of the base paper, where the additives are selectedfrom the group consisting of alginates, polyvinyl alcohol, polyvinylacetates, including partially hydrolysed derivatives and copolymers,modified and unmodified starches, cellulose derivatives, such ascarboxy-methyl cellulose, ethyl-cellulose and hydroxymethyl-cellulose,and combinations thereof. The one or more additives may further compriseinorganic ions, such as phosphates, mono- or divalent metal salts,silicas and other agents known in the art to modify the burn rate, andcombinations thereof. The additives may yet further comprise naturalgums, such as guar gum.

The additives may be applied to the wrapping paper with a liquidcarrier, which may be in the form of a solution, suspension, emulsion ora combination thereof. The liquid carrier may be aqueous, non-aqueous ora combination thereof and may contain an emulsifying agent depending onthe nature of the additives.

In one embodiment, a suspension of additive may be applied within anaqueous carrier. The aqueous carrier penetrates the base papertransporting the additive into its matrix. Once the carrier evaporates,the additive is left within the base paper matrix where it can reducethe diffusion capacity either before or during the burning of thesmoking article. Once applied to the base paper, the liquid carrier isallowed to evaporate allowing the wrapping paper to dry and for theadditive to set within the matrix of the base paper.

In certain embodiments of the present wrapping paper, the diffusioncapacity of the burn-suppressing regions is 0.10 to 0.35 cm/s, e.g. 0.15to 0.35 cm/s, or e.g. 0.10 to 0.30 cm/s, or e.g. 0.15 to 0.30 cm/s, ore.g. 0.15 to 0.25 cm/s, or e.g. 0.20 to 0.30 cm/s, or e.g. 0.20 cm/s to0.25 cm/s.

In certain embodiments of the present wrapping paper, the ratio ofdiffusion capacity between the burn-suppressing regions and thenon-burn-suppressing regions in the wrapping paper is in the range of 5%to 35%, e.g. 10% to 35%, or e.g. 15% to 35%, or e.g. 5% to 30%, or e.g.10% to 30%, or e.g. 15% to 30%, or e.g. 10% to 25%, or e.g. 15% to 25%.In other words, the ratio between the diffusion capacity in theburn-suppressing regions to the diffusion capacity of the base paper iscomprised between 5% to 35%, e.g. 10% to 35%, or e.g. 15% to 35%, ore.g. 5% to 30%, or e.g. 10% to 30%, or e.g. 15% to 30%, or e.g. 10% to25%, or e.g. 15% to 25%. By providing such ratios of diffusion capacitybetween the burn-suppressing regions and the non-burn suppressingregions (i.e., the base paper) it is possible to provide a low ignitionpropensity smoking article with a reduced impact on taste.

In certain embodiments of the present wrapping paper, the fibrousmaterial is a cellulosic fibrous material.

The present invention further relates to a smoking article comprising awrapping paper as in the embodiments described above and in which thewrapping paper surrounds a charge, roll or column of smokable materialto form a tobacco rod.

In certain embodiments of the present smoking article, when a tobaccorod is wrapped by the wrapping paper, the burn-suppressing regions arein a form of stripes extending in a longitudinal direction of thetobacco rod and being spaced apart from each other in a circumferentialdirection of the tobacco rod.

In certain embodiments of the present smoking article, when a tobaccorod is wrapped by the wrapping paper, the burn-suppressing regions arein a form of round annular bands extending in a circumferentialdirection of the tobacco rod and being spaced from each other in alongitudinal direction of the tobacco rod.

Without being bound to a certain theory, the positive effect of thepresent invention, i.e. the combination of an increased number of puffswithout changing the tobacco rod length or diameter is due to thespecific combination of a paper porosity of 10 to 60 CU and at least oneburning additive in an amount of 0.1 to 0.7 wt.-% as laid out above.

The above embodiments can be combined arbitrarily, if appropriate.Further possible embodiments and implementations of the inventioncomprise also combinations of features not explicitly mentioned in theforegoing or in the following with regard to the examples of theinvention. Particularly, a person skilled in the art will also addindividual aspects as improvements or additions to the respective basicform of the invention.

EXAMPLES

The present invention will now be described in detail with reference toexamples thereof. However, these examples are illustrative and do notlimit the scope of the invention.

Example 1

Two 84 mm cigarettes with increased puff count were prepared with thesame tobacco blend. These cigarettes had both a 63 mm tobacco rodattached to a 21 mm filter by a tipping paper. The filters were cut fromthe same filter rod and the tipping papers were cut from the same reel.The tobacco rod of cigarette A was wrapped in a prior art wrapping paper(paper A), while cigarette B was wrapped in a wrapping paper accordingto the invention (paper B). In both wrapping papers the burn-suppressingregions were 6 mm wide annular bands separated between them by 18 mm ina construction similar to the one depicted in FIG. 3. The specificationsof the respective wrapping papers are indicated in Table 1 below.

TABLE 1 Paper A Paper B Basis weight 27 g/m² 24 g/m² Porosity 80 CU 45CU Diffusion capacity in the 0.045 cm/s 0.230 cm/s burn-suppressingregions Diffusion capacity in the non- 2.3 cm/s 1.8 cm/sburn-suppressing regions (base paper diffusion capacity) Burningadditive type Citrate salt Citrate salt Burning additive amount 1.4wt.-% 0.5 wt.-% Filler (calcium carbonate) 27.7 wt.-% 20 wt.-%

These cigarettes were measured under ISO 3308:2012 conditions todetermine their TNCO levels as well as their respective puff counts.Self-extinguishment was also measured for these cigarettes, both whenpositioned on a surface (ISO 12863:2010—referred to as LIP) and whenburning in free air (ISO 12863:2010—referred to as FASE). The resultsare shown in Table 2 below. It was found that wrapping paper B increasedthe puff count of cigarette B by 1.3 while maintaining very similar TNCOlevels. Paper B also shows a high self-extinguishing rate whenpositioned on a surface and a significantly improved performance whenburning in free air.

TABLE 2 Cigarette A Cigarette B Tar 9.8 mg 10.0 mg Nicotine 0.80 mg 0.85 mg CO 9.0 mg  9.3 mg Puff count 6.8 8.1 LIP 100% 94% FASE  30%  8%

Example 2

Two 84 mm low ignition propensity cigarettes were prepared with the sametobacco blend. These cigarettes had both a 57 mm tobacco rod attached toa 27 mm filter by a tipping paper. The filters were cut from the samefilter rod and the tipping papers were cut from the same reel. Thetobacco rod of cigarette C was wrapped in the prior art wrapping paperfrom example 1 (paper A), while cigarette D was wrapped in the wrappingpaper according to the invention from example 1 (paper B).

These cigarettes were measured under ISO 3308:2012 conditions todetermine their TNCO levels as well as their respective puff counts.Self-extinguishment was also measured for these cigarettes, both whenpositioned on a surface (ISO 12863:2010—referred to as LIP) and whenburning in free air (ISO 12863:2010—referred to as FASE). The resultsare shown in Table 3 below. It was found that wrapping paper B increasedthe puff count of cigarette B by 0.9 while maintaining very similar TNCOlevels. Paper B continues to show a high self-extinguishing rate whenpositioned on a surface and a significantly improved performance whenburning in free air.

TABLE 3 Cigarette C Cigarette D Tar 8.0 8.1 Nicotine 0.62 0.68 CO 9.19.2 Puff count 5.6 6.5 LIP 98% 95% FASE 38% 23%

Example 3

Three 84 mm cigarettes were prepared with the same tobacco blend. Thesecigarettes had all a 57 mm tobacco rod attached to a 27 mm filter by atipping paper. The filters were cut from the same filter rod and thetipping papers were cut from the same reel. The tobacco rod of cigaretteE was wrapped in a prior art wrapping paper (paper E), cigarette F waswrapped in a first wrapping paper according to the invention (paper F),and cigarette G was wrapped in a second wrapping paper according to theinvention (paper G). The specifications of the respective wrappingpapers are indicated in Table 4 below.

TABLE 4 Paper E Paper F Paper G Basis weight 26 g/m² 24 g/m² 24 g/m²Porosity 45 CU 30 CU 15 CU Burning additive type Citrate salt Citratesalt Citrate salt Burning additive 1.0 wt.-% 0.4 wt.-% 0.3 wt.-%(citrate) Filler (calcium 31.25 wt.-% 25 wt.-% 22 wt.-% carbonate)

These cigarettes were measured under ISO 3308:2012 conditions todetermine their TNCO levels as well as their respective puff counts. Theresults are shown in Table 5 below. It was found that wrapping papers Fand G increased the puff count of cigarettes F and G by 1.0 and 1.2,respectively, while maintaining very similar TNCO levels to thosemeasured for cigarette E.

TABLE 5 Cigarette E Cigarette F Cigarette G Tar 6.0 6.0 6.3 Nicotine 0.60.5 0.5 CO 6.8 5.7 5.9 Puff count 6.1 7.1 7.3

1. A wrapping paper for a smoking article, comprising a base paper,wherein the base paper comprises a fibrous material, a filler material,and one or more burning additives, wherein: a. a paper porosity of thebase paper is 10 to 60 CU; and b. a total amount of the one or moreburning additives is 0.1 to 0.7 wt.-% based on a dry weight of the basepaper.
 2. The wrapping paper according to claim 1, wherein the one ormore burning additives is selected from the group consisting of citratesalts, acetate salts, phosphate salts, tartrate salts, nitrate salts, ormixtures thereof.
 3. The wrapping paper according to claim 1, wherein abasis weight of the base paper is 20 to 26 g/m².
 4. The wrapping paperaccording to claim 1, wherein an amount of the filler material is 17 to28 wt.-% based on the dry weight of the base paper.
 5. The wrappingpaper according to claim 1, wherein the filler material is selected fromthe group consisting of calcium carbonate, kaolin, clay, talc, titaniumdioxide, alumina trihydrate, precipitated silica and silicates (PSS), ormixtures thereof.
 6. The wrapping paper according to claim 1, wherein adiffusion capacity of the base paper is 1.0 to 2.0 cm/s.
 7. The wrappingpaper according to claim 1, further comprising a plurality ofburn-suppressing regions that are provided apart from each other.
 8. Thewrapping paper according to claim 7, wherein the plurality ofburn-suppressing regions are provided on a surface of the base paper. 9.The wrapping paper according to claim 7, wherein the plurality ofburn-suppressing regions are provided embedded in a matrix of the basepaper.
 10. The wrapping paper according to claim 7, wherein a diffusioncapacity of the plurality of burn-suppressing regions is 0.10 to 0.35cm/s.
 11. The wrapping paper according to claim 10, wherein a ratio ofthe diffusion capacity of the plurality of burn-suppressing regions to adiffusion capacity of the base paper is in the range of 5% to 35%. 12.The wrapping paper according to claim 7, wherein the plurality ofburn-suppressing regions contain at least one additive that reduces adiffusion capacity of the base paper, and wherein the at least oneadditives is selected from the group consisting of alginates, polyvinylalcohol, polyvinyl acetates, modified and unmodified starches, cellulosederivatives, inorganic ions, natural gums, or mixtures thereof.
 13. Thewrapping paper according to claim 7, wherein the plurality ofburn-suppressing regions are in a form of stripes.
 14. The wrappingpaper according to claim 1, wherein the fibrous material is a cellulosicfibrous material.
 15. A smoking article, comprising a charge of smokablematerial surrounded by a wrapping paper according to claim 1.